Cors Error in https://android.clients.google.com/checkin

[LucasFebatis]

Hi, I'm getting a cors error when trying to access 'https://android.clients.google.com/checkin'
I didn't understand if I need to add localhost to a whitelist to go through Cors or if I need to create my own provisioning server

Error follows

Access to fetch at 'https://android.clients.google.com/checkin' from origin 'http://localhost:8081' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

POST https://android.clients.google.com/checkin net::ERR_FAILED

Request failed : TypeError: Failed to fetch

Retrying in 15 seconds